The 1960s, in a seaside town in Latin America. Juan Ludz, 17, caught up in an adolescent conflict with his father, wants to prove that there is a life after death. To do this, he develops a photographic technique that is supposed to reveal the existence of the human soul.
He then meets Ana, his first love. Urged on by their passion, they decide to hold a public demonstration of Juan's experiment in which Ana's face is supposed to be reproduced in a halo of light. However, the challenge is too great for her: during the demonstration, Ana, who is already mentally unstable, has a fit. Her parents then decide to have her interned in a psychiatric hospital.
Shortly after, Juan goes to see Ana and tells her that he plans to run away with her.
Free at last, they spend their first and last night together, during which they each take a pill that is supposed to free them from the burden of their present life and allow them to meet in paradise. Juan's final image of this special night is that of two nurses carrying off Ana's lifeless body.
Twenty years later, Juan wakes up on the plane carrying him back to his sick father.
When he gets home, he finds out that Ana is still alive and now married. He sets off to look for her and, on the way, meets Lilith, a beautiful young woman who awakens the memory of Ana within him, along with a long dormant desire. Juan follows her and, without exchanging a word, makes love to her in an abandoned building. He then meets Ana, who refuses to speak to him...